CN103981446B - A kind of bainite type 700MPa level Twisted Steel and production method thereof - Google Patents

A kind of bainite type 700MPa level Twisted Steel and production method thereof Download PDF

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CN103981446B
CN103981446B CN201410116600.4A CN201410116600A CN103981446B CN 103981446 B CN103981446 B CN 103981446B CN 201410116600 A CN201410116600 A CN 201410116600A CN 103981446 B CN103981446 B CN 103981446B
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steel
twisted steel
700mpa
temperature
bainite
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CN103981446A (en
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李阳
麻晗
黄文克
张建春
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Jiangsu Shagang Iron and Steel Research Institute Co Ltd
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Jiangsu Shagang Iron and Steel Research Institute Co Ltd
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Abstract

The invention provides a kind of bainite type 700MPa level Twisted Steel and production method thereof.Does this Twisted Steel comprise following basal component: C 0.10 ~ 0.20%, Si 0.40 ~ 0.60%, Mn 0.80 ~ 1.40%, V 0.06 ~ 0.14%, Mo 0.10-0.16%, Cr 0.60 ~ 0.70%, B 0.001 ~ 0.003%, N 120-240ppm; Optional component: Nb 0.001 ~ 0.04%, Ti 0.001 ~ 0.02%, Cu any one or two or more combinations in 0.01 ~ 0.05%; All the other are Fe and inevitable impurity.This Twisted Steel adopts converter or electrosmelting, the refining of LF stove, continuous small-billet casting tandem rolling, the technique of cold bed cooling.Adopt the Twisted Steel lower yield strength > 700MPa that mentioned component and method are produced.

Description

A kind of bainite type 700MPa level Twisted Steel and production method thereof
Technical field
The present invention relates to a kind of bainite type 700MPa level Twisted Steel and production method thereof, belong to ferrous metallurgy and steel rolling field.
Background technology
Deformed Steel Bars is the primary article of building trade, plays supporting structure and mainly stressed effect.And along with building is to high-rise, large scale development, strength levels necessitate and other performance requriementss of Deformed Steel Bars are also more and more higher.At present, country is just wideling popularize high-strength deformed steel bar muscle, can predict, high-strength deformed steel bar develops towards higher intensity rank, domestic existing Some Enterprises is developed 600MPa level Deformed Steel Bars and is realized outputization and produces, and more the 700MPa level reinforcing bar of high strength not yet has correlative study and outputization to produce.As everyone knows, high strength cast iron can reduce Deformed Steel Bars consumption, reduces reinforcing bar density, saves space, can realize the reduction of energy consumption and the improvement of environment, and therefore, research high strength cast iron has great reality and economic implications.The exploitation of 700MPa level reinforcing bar can be applicable to the fields such as priority project building and nuclear power, greatly improves security and the economy of building.The highest level of current hot-rolled ribbed bars is 600MPa level reinforcing bar HRB600, and the minimum rank of finish rolling deformed bar is PSB785, mostly is middle carbon Medium Alloy Steel, alloy content is high, complex process, and cost is difficult to control, and higher carbon content can only adopt mechanical connection, link cost increases.Easy welding, the 700MPa level reinforcing bar of low cost is significant, can fill up the blank in this field.
600MPa level and following Deformed Steel Bars tissue are mainly ferrite and pearlite tissue, rely on higher carbon, silicon, Fe content, improve intensity in conjunction with v n micro alloying method simultaneously.And 700MPa level Deformed Steel Bars requires higher intensity, plasticity can not decline simultaneously, therefore, intensity is improved only by raising solid solution element carbon, silicon, Fe content, plasticity not only can be made to reduce, and welding property can be caused to be deteriorated, and this is disadvantageous to the large-scale promotion application of High Strength Steel Bar simultaneously.The domestic correlative study also having a small amount of 700MPa level Deformed Steel Bars at present, but it is higher to there is cost, producting process difficulty is larger, be not suitable for the problems such as large-scale application, " antidetonation weather-resistant and high-strength degree YS700MPa level hot-rolled reinforced bar " chemical composition as Iron and Steel Research Geueral Inst application is: C:0.20 ~ 0.25, Si:0.40 ~ 0.80, Mn:1.20 ~ 1.60, P≤0.035, S≤0.035, V:0.06 ~ 0.20, N:0.010 ~ 0.030, Ni:0.20 ~ 2.0, Cr:0.20 ~ 2.0, Ti:0.01 ~ 0.03, in conjunction with embodiment Cr, Ni content is limit in composition range, the alloying elements such as itself Cr and Ni known are higher, cost is also in higher level, only be applicable to the engineer applied under particular surroundings, simultaneously, a large amount of alloying elements brings certain difficulty also to smelting work.
Summary of the invention
This patent is aimed to provide one and is produced by micro-alloying technology, organizes based on ferrite and bainite, stable mechanical property, meets the low cost 700MPa level Twisted Steel of scale operation needs.
For realizing foregoing invention, take following technical scheme:
A kind of its basal component of bainite type 700MPa level Twisted Steel is: C0.10 ~ 0.20%, Si0.40 ~ 0.60%, Mn0.80 ~ 1.40%, V0.06 ~ 0.14%, Mo0.10 ~ 0.16%, Cr0.60 ~ 0.70%, B0.001 ~ 0.003%, N120 ~ 240ppm; Optional component: Nb0.001 ~ 0.040%, Ti0.001 ~ 0.020%, any one or two or more combinations in Cu0.01 ~ 0.050%; All the other are Fe and inevitable impurity.
Relative to low level Deformed Steel Bars, 700MPa level reinforcing bar requires higher intensity, will ensure its plasticity simultaneously, improves solid solution element content according to technological line in the past, ensures high-ductility while being difficult to realize high strength.And the Bar Wire Product passes such as Deformed Steel Bars are fixed, roll speed is fast, be difficult to by changing draught, the means such as strain rate realize the object of controlled rolling, therefore the design of alloy has vital role, the present invention is by introducing Mo, Cr, the elements such as B, it is utilized to strengthen hardening capacity, postpone perlitic transformation, reduce the features such as bainite transformation temperature, develop the bainite type high-strength deformed steel bar that a kind of carbon content is relatively low, compared with the bainitic steel of low carbon content, there is high strength, high-ductility, the feature of easy welding, in the exploitation of high-level Deformed Steel Bars, adopt the operational path of low-carbon bainite to have larger advantage.Bainite transformation is that a kind of carbon expands the Shear-type phase transformation of calculating and controlling, a small amount of B element segregation is on austenite grain boundary, hinder ferrite nucleation on crystal boundary, suppress ferritic generation, Mo element belongs to middle carbide, on the austenitic hardening capacity formed when improving critical zone heating, there is great impact, Mo element to the restraining effect of perlitic transformation clearly, the carbide that refinement is simultaneously separated out from ferrite, at MC type carbide, (M is titanium, niobium, vanadium) middle vanadium of replacing in carbide, the elements such as titanium, form double carbide, in conjunction with the Cr element that can improve hardening capacity, facilitate the generation of bainite.
Based on mentioned component scheme, through molten iron pre-desulfurization, after molten iron, steel scrap and the pig iron are added oxygen coverter, carry out conventional top bottom blowing, add lime, rhombspar, magnesite ball carry out slag making; Control end point carbon >=0.06wt%, tapping temperature is less than 1690 DEG C; Adopt wash heat and omnidistance BOTTOM ARGON BLOWING during tapping, when ladle molten steel amount is greater than 1/4, in ladle, add reductor, high carbon ferromanganese, ferrosilicon, ferrochrome etc., add when ladle molten steel amount reaches 3/4, to carry out deoxidation alloying.After tapping, molten steel send LF stove to carry out refining, and Argon 3 minutes, then carries out electropolarization slag, add lime, and controlling basicity of slag is 6.0 ~ 8.0, adds ferro-boron etc. after refining terminates; To molten steel Argon 10 minutes; Heating molten steel to temperature is, after 1570 ~ 1600 DEG C, add conventional insulating covering agent, send continuous casting working procedure, and tundish temperature is 1525 ~ 1550 DEG C, and continuous casting becomes small billet.Steel billet is sent into the process furnace that Heating temperature is 1050 ~ 1150 DEG C, heat 80 ~ 120 minutes, steel billet start rolling temperature is 950 ~ 980 DEG C, and finishing temperature is 850 ~ 900 DEG C, temperature on cooling table is 680 ~ 830 DEG C, can obtain 700MPa level High Strength Steel Bar through cold bed cooling.
Feature of the present invention introduces bainite forming element, form easily welding, plastic strength is organized all preferably, intensity can reach 700MPa level, and smelting procedure does not need special process, simple to operate, rolling technology is compared with intensity rank Deformed Steel Bars, without complicated requirement, advantage of lower cost, can carry out large-scale promotion and use under multiple environment.
Other element interactions in component:
C: carbon is a kind of strengthening element of cheapness, carbon can form carbonitride with elements such as the vanadium in steel, molybdenums, improve the intensity of steel matrix, but carbon is too high, plasticity and the toughness of steel can be reduced, reduce welding property simultaneously, for ensureing steel performance, reduce costs, the present invention limits carbon content at 0.10 ~ 0.20wt% simultaneously
Si: mainly play solution strengthening by being solid-solubilized in ferrite in steel, and can reduce the velocity of diffusion of carbon in austenite, postpones ferrite and pearlite phase transformation, can improve yield strength and tensile strength.But element silicon can improve ductile-brittle transition temperature.Therefore the zone of reasonableness of silicon is 0.40 ~ 0.60wt%.
Mn: manganese is the one of the chief elements improving intensity in Deformed Steel Bars is also the effective element of the hardening capacity improving steel.In the present invention, manganese improves the intensity of matrix as a kind of main solution strengthening element, too high Fe content can reduce ferrite and generate temperature, make precipitated phase too tiny and affect strengthening effect, simultaneously, Fe content is higher can improve carbon equivalent equally, affect welding property, manganese element zone of reasonableness is 0.80 ~ 1.40wt%.
V is a kind of important V-N steel element, can separate out V (C, N) compound in the operation of rolling, stops austenite and ferrite crystal grain to be grown up, has stronger precipitation strength and refined crystalline strengthening effect, can significantly improve the intensity of Twisted Steel; But content of vanadium is too high can reduce material plasticity, rolls up cost, and therefore, the scope of V content is set to 0.06 ~ 0.14% simultaneously.
N can promote the precipitation of V (C, N) compound, the size of refinement precipitated phase, can give full play to the potentiality of V precipitation strength, and to raising Deformed Steel Bars intensity, the usage quantity reducing V has obvious effect.
Nb: micro alloying element, can form a large amount of Carbide Precipitations and improve steel strength mutually, and niobium can also produce strong drag interaction to the migration of ferrite/Austenite Interfacial simultaneously, improves austenite recrystallization temperature, crystal grain thinning.
Ti: carbide forming element, the nitride that high temperature is separated out can stop grain growth.The titanium that in steel, content is too much can form thick Ti (C, N) in process of cooling, reduces the pinning effect to recrystal grain, and therefore limiting Ti content in steel is Ti:0.001 ~ 0.02wt%.
Cu: except can except stable austenite, the activity of carbon can also be improved, promote that alloy carbide is separated out, thus indirectly play the effect that refinement changes tissue and precipitation strength, but the trend of copper oriented crystal boundary and surface enrichment in steel, and the fusing point of copper is lower, thus adds too much copper and easily occur hot-short, copper content is 0.01 ~ 0.050%.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is further elaborated, but these embodiments have any restriction to the present invention absolutely not.Those skilled in the art under the enlightenment of this specification sheets to the invention process in any variation of doing all will drop in the scope of claims.
Embodiment 1
Adopt converter smelting, through LF refining, continuous casting becomes 150mm × 150mm small billet; In process furnace, soaking zone Heating temperature is 1050 ~ 1100 DEG C; Adopt continous way bar wire rod rolling mill to be rolled, rolling specs is ∮ 25mm, start rolling temperature 950 ~ 980 DEG C, finishing temperature 850 ~ 900 DEG C, and temperature on cooling table is 780 ~ 830 DEG C, cold bed naturally cools to room temperature and namely obtains 700MPa level Twisted Steel.The chemical composition of this reinforcing bar is: C0.18wt%, Si0.50wt%, Mn1.10wt%, V0.12wt%, Cr0.60wt%, Mo0.10wt%, N200ppm, B20ppm.Table 1 is mechanical property, yield strength >700MPa, tensile strength >850MPa, and elongation after fracture > 14% is organized as ferrite and bainite.
Table 1 ∮ 25mm700MPa steel bar mechanics performance
Embodiment 2
Adopt converter smelting, through LF refining, continuous casting becomes 150mm × 150mm small billet; In process furnace, soaking zone Heating temperature is 1050 ~ 1100 DEG C; Adopt continous way bar wire rod rolling mill to be rolled, rolling specs is ∮ 25mm, start rolling temperature 950 ~ 980 DEG C, finishing temperature 870 ~ 900 DEG C, and temperature on cooling table is 730 ~ 770 DEG C, cold bed naturally cools to room temperature and namely obtains 700MPa level Twisted Steel.The chemical composition of this reinforcing bar is: C0.14wt%, Si0.50wt%, Mn1.00wt%, V0.10wt%, Cr0.70wt%, Mo0.14wt%, N185ppm, B20ppm.Table 2 is mechanical property, yield strength >700MPa, tensile strength >850MPa, and elongation after fracture > 14% is organized as ferrite and bainite.
Table 2 ∮ 25mm700MPa steel bar mechanics performance

Claims (2)

1. a bainite type 700MPa level Twisted Steel, it is characterized in that, by following element by weight percentage (%) form: C0.10 ~ 0.20%, Si0.40 ~ 0.60%, Mn0.80 ~ 1.40%, V0.06 ~ 0.14%, Mo0.10 ~ 0.16%, Cr0.60 ~ 0.70%, B0.001 ~ 0.003%; Optional component: Nb0.001 ~ 0.040%, Ti0.001 ~ 0.020%, any one or two or more combinations in Cu0.01 ~ 0.050%; All the other are Fe and inevitable impurity, and Steel Bar Tensile Strength > 850MPa, lower yield strength > 700MPa, elongation after fracture > 14%, microstructure is ferrite and bainite.
2. the production method of bainite type 700MPa level Twisted Steel according to claim 1, comprise the electric furnace that carries out successively or converter smelting, LF refining, continuous small-billet casting tandem rolling, cold bed cooling, it is characterized in that: in the operation of rolling, Heating temperature 1050 ~ 1100 DEG C, start rolling temperature 950 ~ 1000 DEG C, finishing temperature 850 ~ 900 DEG C, temperature on cooling table is 680 ~ 830 DEG C.
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CN104313499B (en) * 2014-11-07 2016-08-17 江苏天舜金属材料集团有限公司 A kind of high intensity bridge steel plate muscle and Technology for Heating Processing thereof
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CN106555123B (en) * 2016-10-26 2018-05-22 江苏省沙钢钢铁研究院有限公司 A kind of corrosion-resistant high yield ratio anti-seismic steel bar and its production method
CN107828952A (en) * 2017-11-30 2018-03-23 攀钢集团攀枝花钢铁研究院有限公司 Steel Bar and its LF stove production methods are built containing V, Ti, Cr microalloy
CN109972035B (en) * 2019-03-28 2020-12-22 江苏省沙钢钢铁研究院有限公司 800 MPa-level hot-rolled twisted steel and production method thereof
CN112501518B (en) * 2020-12-01 2022-04-01 青岛科技大学 Bainite steel and preparation method and application thereof
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